Jennifer Lawrence brought her signature brand of humor to a live reading of the 1998 cult classic The Big Lebowski on Friday, but she nearly didn’t get to read her lines thanks to a flub by Olivia Munn.

Lawrence, 24, joined X-Men: Apocalypse costar Munn and an impressive celebrity cast to perform the script from the popular Coen Brothers’s film during the Just for Laughs Festival in Montreal, Canada.

The actress, who was reading for Jeffrey Lebowski’s daughter Maude (a part originally played by fellow Oscar-winner Julianne Moore), had a script mix-up with Munn, who was playing Bunny, Maude’s stepmother, according to Mashable.

When Munn read Lawrence’s opening line, the entire cast was confused.

“It was highlighted, motherf—–s,” Munn said before switching script pages with the Silver Linings Playbook star.

“We’ve been waiting three hours to get to my part and it’s all falling to s—,” Lawrence responded, reported Mashable.

Michael Fassbender, who read for the film’s star, “The Dude,” got very into his role as the laid-back burnout who gets accidentally embroiled in the Los Angeles underworld.